There is no Alfa Romeo part number for this item...That said, they can be used when the tapered windscreen pillar seating bolt has been over chromed, &/or when the tapered seating hole in the car has had an excessive amount of paint applied. These situations result in the pillar standing proud of the body with a significant gap to be filled between the pillar base and the bodywork. 1.5mm thick.
 
Part Name: Spider Windscreen (Windshield) Pillar Base Seating Gaskets, 1.5mm, Set Of 2
AlfaStop Product Code: 1RU220
Original Alfa Romeo Part No: 
Model: Guilia 101 Series, Giulietta 750 & 101
Quantity Per Car: 1